The rehearsals here are done.
And the sound quality would be HORRENDOUS on the recording.
It was fairly muffled, even to a human ear.
Also, it was only U2's people inside the building, which I'm sure was security swept for recorders. The security was completely airtight. They didn't want a repeat of 2001 where there was a incomplete video of the show selling on ebay before opening night.
U2FP